Some cells came in blank with a flag

A cell Bizsec cannot read is left blank and flagged rather than guessed at. On the preview, choose View on a company to see its flags. Each one shows what your file said, struck through, and why: a value it could not read at all, a date that could be day-first or month-first, a date that cannot be right, or an activity code that is not in the SSIC 2025 table. A flagged cell imports blank, so fill it in on the entity once the import is done. A company name or UEN is never left blank like this. Bizsec holds that company as Needs review until you correct it on the preview.

Import never invents a value.